CN213448534U - Sealing and lowering combined pressure-bearing water control system - Google Patents
Sealing and lowering combined pressure-bearing water control system Download PDFInfo
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- CN213448534U CN213448534U CN202021539813.5U CN202021539813U CN213448534U CN 213448534 U CN213448534 U CN 213448534U CN 202021539813 U CN202021539813 U CN 202021539813U CN 213448534 U CN213448534 U CN 213448534U
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Abstract
The utility model provides a seal control pressure-bearing water system that falls and combine, include: the device comprises a bottom-falling type waterproof curtain, a first type of downcomer well and a second type of downcomer well; the periphery of the bottom-falling type waterproof curtain is closed, and the bottom of the bottom-falling type waterproof curtain penetrates through the medium coarse sand gravel-sandwiched pebbles to enter a waterproof layer; the first type of downcomer well and the second type of downcomer well are located in an area surrounded by a bottom-falling type waterproof curtain, the first type of downcomer well is arranged in a general excavation area of the foundation pit, and the second type of downcomer well is arranged at the periphery of a pit in the area surrounded by the bottom-falling type waterproof curtain; the first type of downcast pipe well sequentially comprises a solid pipe, a water filter pipe and a settling pipe from top to bottom; the second type of downcomer well is sequentially provided with a solid pipe, a strainer and a settling pipe from top to bottom. The utility model has the advantages that: the drainage effect is good, and the extraction quantity of the groundwater outside the foundation pit and the influence degree and range of the precipitation in the foundation pit on the surrounding environment are reduced.
Description
Technical Field
The utility model relates to an ultra-deep foundation ditch excavation confined water control engineering field, concretely relates to all ring edge borders is complicated, the excavation degree of depth is three-layer basement or the deep foundation ditch confined water precipitation field more than 16m of excavation degree of depth, especially relates to a seal control confined water system that falls and combine.
Background
The first-level steps of Yangtze river and Han river are key construction areas of major projects in Wuhan city, a large number of foundation pit projects with excavation depths above three layers of basements need to be uncovered through the top plate of the confined aquifer, and the control of underground water in the confined aquifer becomes a serious difficulty of the foundation pit projects. Meanwhile, the foundation pit pumps a large amount of underground water for a long time to cause the water level of the surrounding underground water to drop, and the water level of the underground water drops to cause deformation of soil layers and settlement of the ground, so that cracking and destruction of surrounding roads and houses are caused. Therefore, it is necessary to provide an effective confined water control system for this type of foundation pit confined water treatment.
Rock-soil strata of I-level terraces of Yangtze river and Hanjiang river are lake sediment, alluvial sediment and surging sediment, and generally have typical binary structures of thin upper parts and thick lower parts. The upper layer mainly takes cohesive soil as a main part, and partial areas can also have sludge or mucky soil which is distributed in pieces; the lower layer can be divided into three sub-layers, namely the top is an interaction layer consisting of silt and silt-containing silty clay, which is commonly called as a 'flower-containing layer' or a 'transition layer' (a first sub-layer); the middle-lower part is provided with a silt layer, a fine silt layer and a medium coarse sand layer (a second sub-layer); the bottom is a gravel layer (third sublayer).
The groundwater types of level I of Yangtze river and Hanjiang river are mainly divided into four types. First, the upper layer stagnant water that exists in the miscellaneous fill in upper portion holds, and the effectual hydraulic connection who has completely cut off upper layer stagnant water and lower part hole confined water of cohesive soil layer, and the cohesive soil layer bottom is the water proof roof of lower part confined aquifer promptly. And the second is weak confined water in the interbed, the lithology of the interbed is silt, clay and silt interbed, the main characteristic of the interbed soil permeability is that the horizontal permeability coefficient is larger than the vertical permeability coefficient, the permeability has obvious anisotropy, and engineering geological problems such as side wall sand flowing and the like are easy to occur when a deep foundation pit is excavated and uncovers the soil layer. Thirdly, the confined water existing in the sandy soil at the lower part is abundant in water quantity and has hydraulic connection with Yangtze river and Han river. Fourthly, the karst fissure water of the bedrock is generated in the cracks of the underlying bedrock, the water quantity is small, the burial depth is large, and the fissure water has certain hydraulic connection with the confined water in the upper sandy soil layer.
The excavation depth is three-layer basement or the deep foundation pit of excavation depth more than 16m will take off lower part confined aquifer roof, in order to satisfy the foundation pit excavation demand, the water level generally need drop to 0.5m below the basement bottom and more than, and the total degree of drop of water level is big. Meanwhile, the operation period of the downcomer well of the deep and large foundation pit is long, and the overflow supply of weak pressure-bearing water at the upper part and stagnant water at the upper layer can be caused by extracting a large amount of pressure-bearing water for a long time, so that the problems of water release, consolidation and compression of interbedded soil, soft plastic and plastic cohesive soil, settlement and cracking of surrounding buildings, roads and municipal rails and the like are caused. Therefore, it is urgent to provide an effective system for controlling the confined water.
Disclosure of Invention
In order to solve the problem, the utility model provides a seal control pressure-bearing water system that falls and combine through the inside and outside groundwater hydraulic connection of the isolated foundation ditch of bottom formula water proof curtain, draws water in the reduction foundation ditch to the influence of all ring edge borders to effectual control groundwater, this kind of system have safe and reliable, reduce foundation ditch precipitation to advantages such as all ring edge borders influence.
The pressure-bearing water control system comprises a bottom-falling type waterproof curtain, a first type of downcomer well and a second type of downcomer well;
the periphery of the bottom type waterproof curtain is closed, and the bottom of the bottom type waterproof curtain penetrates through medium coarse sand and gravel and pebbles to enter a waterproof layer (namely the underburden); the first type of downcomer well and the second type of downcomer well are located in an area surrounded by a bottom-falling type waterproof curtain, the first type of downcomer well is arranged in a general excavation area of a foundation pit, and the second type of downcomer well is arranged at the periphery of a pit in the area surrounded by the bottom-falling type waterproof curtain;
the first type of downcast pipe well sequentially comprises a solid pipe, a water filter pipe and a settling pipe from top to bottom, wherein the water filter pipe is positioned in the second silt layer or the lower half part of the water filter pipe penetrates through the second silt layer to enter the fine silt layer;
the second type downcomer well is sequentially provided with a solid pipe, a water filter pipe and a settling pipe from top to bottom, and the lower half part of the water filter pipe penetrates through the second silt layer to enter the fine silt layer.
Further, the bottom-falling type waterproof curtain is a cement-soil mixing wall with equal thickness formed by a TRD, CSM or a construction process combining the TRD and the CSM, or an underground continuous wall.
Further, the deviation of verticality of the falling bottom type water-proof curtain is not more than 1/250, and the deviation of position, the deviation of depth and the deviation of thickness of the falling bottom type water-proof curtain are not more than 50mm, not more than 50mm and not more than 20mm, respectively.
Further, the depth of the falling-bottom type waterproof curtain entering the waterproof layer is at least 1.0 m.
Further, the first type of downcomer well is a medium-depth tube well with the well depth of 23-30 m.
Further, the second type of downcomer well is an ultra-deep tube well with a well depth of 35-45 m.
Furthermore, a submersible pump is arranged in each of the first type dewatering pipe well and the second type dewatering pipe well, and the submersible pumps are located in the water filtering pipes.
Further, the pump capacity of the submersible pump is 60-80 m3/h。
Further, the pit-in-pit includes a main building, a catch pit, and an elevator shaft.
Furthermore, a water meter and a water stop valve are arranged above the first type of downcomer well and the second type of downcomer well, the water meter is used for monitoring the amount of confined water discharged from the control confined water system, and the water stop valve is used for preventing high-pressure water from reversely flowing back into the submersible pump to damage the submersible pump; the water meter and the water stop valve are connected with the submersible pump through a water pipe.
The utility model provides a beneficial effect that technical scheme brought is:
1. the possibility of flowing sand, flowing soil and gushing of a water collecting well, an elevator shaft and the like is reduced
In actual engineering, the underground water level can not meet the design requirement or pits in the water collecting well, the elevator shaft and the like are soaked in the underground water for a long time, so that engineering phenomena of soil flowing, sand flowing, local uplift and the like of the side walls of the pits in the water collecting well, the elevator shaft and the like are caused, and the pits in the water collecting well, the elevator shaft and the like are difficult to excavate to the bottom. Adopt the utility model discloses control groundwater, whole foundation ditch include pit in the sump pit such as sump pit, elevartor shaft precipitation effectual, guaranteed the smooth construction of pit in the pit such as sump pit, elevartor shaft to reduce the pit in pit lateral wall sand flow, soil flow, the possibility of gushing suddenly such as sump pit, elevartor shaft.
2. Pumping ground water as little as possible
A bottom-falling type waterproof curtain, a medium-depth pipe well and an ultra-deep pipe well are adopted to jointly control the pressure-bearing water system in the foundation pit excavated in the soil layer, the bottom-falling type waterproof curtain effectively isolates hydraulic connection inside and outside the foundation pit, and extraction of groundwater outside the foundation pit is effectively reduced. Based on the distribution of pit in the pit such as sump pit, elevartor shaft, set up the precipitation pipe well of the different degree of depth, the pit is general to be dug regional setting medium-depth pipe well, and pit periphery such as sump pit, elevartor shaft sets up ultra-deep pipe well, carries out precipitation as required, reduces the extraction of groundwater as far as.
3. Reducing the impact on the surrounding environment
The method for dewatering by combining the suspended waterproof curtain with the pipe well needs a large amount of long-time pumping of underground water, has large influence on the surrounding environment and has wide influence range. And adopt the utility model discloses control groundwater, the inside and outside water conservancy contact of foundation ditch effectively is closed to the formula of falling water proof curtain, forms the high water head difference inside and outside the foundation ditch, and precipitation is all less to all ring edge border influence degree and scope in the foundation ditch.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic plan view of a sealing and landing combined pressurized water control system according to an embodiment of the present invention;
fig. 2 is a schematic sectional view of a sealing and lowering combined pressurized water control system according to an embodiment of the present invention;
figure 3 is the second type downcomer well block diagram in the embodiment of the invention.
Wherein: 1-miscellaneous fill layer, 2-cohesive soil layer, 3-silt sand with silt clay and silt layer, 4-first silt layer, 5-second silt layer, 6-fine sand layer, 7-medium coarse sand with gravel layer, 8-water-resisting layer (underlying bedrock), 9-bottom-falling type water-resisting curtain, 10-first type downpipe well, 11-second type downpipe well, 12-main building, water-collecting well, pit-in-pit such as elevator shaft, 13-solid pipe, 14-water filtering pipe, 15-submersible pump, 16-settling pipe, 17-water meter, 18-water stop valve.
Detailed Description
In order to clearly understand the technical features, objects and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The embodiment of the utility model provides a seal control confined water system that falls and combine for the foundation ditch falls confined water, suitable stratum includes miscellaneous back-filling layer 1, stickness soil layer 2, silt presss from both sides whitewashed clay and silt layer 3, first silt layer 4, second silt layer 5, fine sand layer 6, well coarse sand presss from both sides gravel pebble layer 7 and water barrier 8.
Referring to fig. 1, fig. 1 is a schematic view of a sealing and lowering combined pressure-bearing water control system according to an embodiment of the present invention, which specifically includes: a falling-bottom waterproof curtain 9, a first type downcomer well 10 and a second type downcomer well 11;
arranging the bottom-falling type waterproof curtain with the periphery closed in the foundation pit, wherein the bottom end of the bottom-falling type waterproof curtain penetrates through the medium coarse sand gravel-included pebble layer 7 and enters a waterproof layer 8 (namely the underlayer rock) for 1.0 m; the first type of downcomer well 10 and the second type of downcomer well 11 are located in a closed area surrounded by a bottom-falling type waterproof curtain, the first type of downcomer well 10 is arranged in a common excavation area of a foundation pit, and the second type of downcomer well 11 is arranged at the periphery of a main building, a water collecting well, an elevator shaft and other pit-in-pit in the closed area surrounded by the bottom-falling type waterproof curtain;
the bottom-falling type waterproof curtain 9 is an equal-thickness cement-soil mixing wall formed by a TRD or CSM or a construction process combining the TRD and CSM, and the bottom-falling type waterproof curtain 9 can also be an underground continuous wall.
The first type of downcomer well 10 is a medium-depth tube well with a well depth of 23-30 m. As shown in fig. 2, the first type downcomer well 10 is sequentially provided with a solid pipe 13, a strainer 14 and a settling pipe 16 from top to bottom, the bottom end of the solid pipe 13 penetrates through the first silt layer 4 and enters the second silt layer 5, because the stratum has undulation, when the solid pipe is located at different positions, the strainer 14 may be located in the second silt layer 5, or the lower half of the strainer 14 penetrates through the second silt layer 5 and enters the fine silt layer 6, and the settling pipe 16 is also located in the second silt layer 5;
the second type of downcomer well 11 is an ultra-deep tube well with a well depth of 35-45 m. As shown in fig. 2-3, the second-type downcomer well 11 is sequentially a solid pipe 13, a strainer 14 and a settling pipe 16 from top to bottom, the bottom end of the solid pipe 13 penetrates through the first silt layer 4 and enters the second silt layer 5, the lower half portion of the strainer 14 penetrates through the second silt layer 5 and enters the fine silt layer 6, the settling pipe 16 is located in the fine silt layer 6, and the second-type downcomer well 11 is used for extracting confined water in the second silt layer 5 and the fine silt layer 6.
The first type of downcomer well 10 and the second type of downcomer well 11 are both provided with a submersible pump 15, the submersible pump 15 is positioned in the strainer 14, and the pump capacity of the submersible pump is 60-80 m3And h, pumping the confined water in the foundation pit.
The plane of the falling-bottom type waterproof curtain wall 9 is arranged to be closed along the periphery of the foundation pit, the elevation of the top surface of the falling-bottom type waterproof curtain wall 9 is the site ground or the bottom surface of the crown beam, and the elevation of the bottom surface is the depth 1.0m of a waterproof layer 8 (namely, the underburden rock). The main technical parameters of the falling-bottom waterproof curtain wall 9 are as follows:
(1) the cement is P.O42.5 grade ordinary Portland cement, and the impervious coefficient of the falling-bottom type waterproof curtain 9 is not more than 10- 7cm/s；
(2) The deviation of perpendicularity of the drop-bottom type water-stop curtain 9 is not more than 1/250, and the deviation of position, the deviation of depth and the deviation of thickness of the drop-bottom type water-stop curtain 9 are not more than 50mm, not more than 50mm and not more than 20mm, respectively.
A water meter 17 and a water stop valve 18 are further arranged above the first type downcomer well 10 and the second type downcomer well 11, the water meter 17 is used for monitoring the amount of confined water discharged from the control confined water system, and the water stop valve 18 is used for preventing high-pressure water from reversely flowing back into the submersible pump to damage the submersible pump; the water meter 17 and the water stop valve 18 are connected with the submersible pump 15 through a water pipe.
The utility model relates to a pressure-bearing water control system's operation step is: as shown in fig. 1-2, firstly, a row of bottom-falling type waterproof curtains 9 with enclosed periphery are constructed outside the underground space of the building, the bottom-falling type waterproof curtains 9 penetrate through the medium coarse sand gravel pebble layer 7 and enter a waterproof layer 8 (namely, an underlying bedrock) for 1.0m, and hydraulic connection of the water inside and outside the foundation pit is isolated; then, a certain number of first type downcast wells 10 and second type downcast wells 11 are constructed in the falling-bottom type waterproof curtain 9 according to the design requirements of the plane of the downcast wells, and the first type downcast wells 10 and the second type downcast wells 11 are located inside the falling-bottom type waterproof curtain 9, so that a closed pumping environment is formed in the whole foundation pit. The opening of the first type dewatering pipe well 10 and the second type dewatering pipe well 11 and the water pumping amount are controlled according to the excavation depth of the foundation pit, and dewatering is carried out according to needs. Before a foundation pit is excavated to the common excavation depth, the first type downcomer well 10 and the second type downcomer well 11 need to be opened, but the water pumping amount of the second type downcomer well 11 can be matched with that of the first type downcomer well 10; when the pits 12 in the main building, the water collecting well, the elevator shaft and the like begin to be excavated, the water pumping amount of the second type dewatering pipe well 11 can be increased so as to meet the requirements of the pits 12 in the main building, the water collecting well, the elevator shaft and the like, and thus the dewatering can be really realized according to the requirements.
The utility model has the advantages that:
1. the possibility of flowing sand, flowing soil and gushing of a water collecting well, an elevator shaft and the like is reduced
In actual engineering, the underground water level can not meet the design requirement or pits in the water collecting well, the elevator shaft and the like are soaked in the underground water for a long time, so that engineering phenomena of soil flowing, sand flowing, local uplift and the like of the side walls of the pits in the water collecting well, the elevator shaft and the like are caused, and the pits in the water collecting well, the elevator shaft and the like are difficult to excavate to the bottom. Adopt the utility model discloses control groundwater, whole foundation ditch include pit in the sump pit such as sump pit, elevartor shaft precipitation effectual, guaranteed the smooth construction of pit in the pit such as sump pit, elevartor shaft to reduce the pit in pit lateral wall sand flow, soil flow, the possibility of gushing suddenly such as sump pit, elevartor shaft.
2. Pumping ground water as little as possible
A bottom-falling type waterproof curtain, a medium-depth pipe well and an ultra-deep pipe well are adopted to jointly control the pressure-bearing water system in the foundation pit excavated in the soil layer, the bottom-falling type waterproof curtain effectively isolates hydraulic connection inside and outside the foundation pit, and extraction of groundwater outside the foundation pit is effectively reduced. Based on the distribution of pit in the pit such as sump pit, elevartor shaft, set up the precipitation pipe well of the different degree of depth, the pit is general to be dug regional setting medium-depth pipe well, and pit periphery such as sump pit, elevartor shaft sets up ultra-deep pipe well, carries out precipitation as required, reduces the extraction of groundwater as far as.
3. Reducing the impact on the surrounding environment
The method for dewatering by combining the suspended waterproof curtain with the pipe well needs a large amount of long-time pumping of underground water, has large influence on the surrounding environment and has wide influence range. And adopt the utility model discloses control groundwater, the inside and outside water conservancy contact of foundation ditch effectively is closed to the formula of falling water proof curtain, forms the high water head difference inside and outside the foundation ditch, and precipitation is all less to all ring edge border influence degree and scope in the foundation ditch.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A sealing and dropping combined control bearing water system is used for controlling and treating bearing water of a foundation pit, and applicable strata comprise a miscellaneous fill layer, a cohesive soil layer, a silt layer, a first silt layer, a second silt layer, a fine silt layer, a medium coarse sand gravel layer and a water-resisting layer; the method is characterized in that: the control confined water system includes: the device comprises a bottom-falling type waterproof curtain, a first type of downcomer well and a second type of downcomer well;
arranging a bottom-falling type waterproof curtain with the periphery closed in the foundation pit, wherein the bottom end of the bottom-falling type waterproof curtain penetrates through the medium coarse sand gravel-included pebbles to enter a waterproof layer; the first type of downcomer well and the second type of downcomer well are located in a closed area surrounded by a bottom-falling type waterproof curtain, the first type of downcomer well is arranged in a common excavation area of a foundation pit, and the second type of downcomer well is arranged at the periphery of a middle pit in the closed area surrounded by the bottom-falling type waterproof curtain;
the first type of downcast pipe well sequentially comprises a solid pipe, a water filter pipe and a settling pipe from top to bottom, wherein the water filter pipe is positioned in the second silt layer or the lower half part of the water filter pipe penetrates through the second silt layer to enter the fine silt layer;
the second type downcomer well is sequentially provided with a solid pipe, a water filter pipe and a settling pipe from top to bottom, and the lower half part of the water filter pipe penetrates through the second silt layer to enter the fine silt layer.
2. A seal-and-fall combined control pressurized water system as claimed in claim 1, wherein: the bottom-falling type waterproof curtain is a cement-soil mixing wall with equal thickness formed by a TRD, CSM or a construction process combining the TRD and the CSM, or an underground continuous wall.
3. A seal-and-fall combined control pressurized water system as claimed in claim 1, wherein: the falling bottom type water-proof curtain has a verticality deviation not greater than 1/250, and a position deviation, a depth deviation and a thickness deviation not greater than 50mm, not greater than 50mm and not greater than 20mm, respectively.
4. A seal-and-fall combined control pressurized water system as claimed in claim 1, wherein: the depth of the falling-bottom waterproof curtain entering the waterproof layer is at least 1.0 m.
5. A seal-and-fall combined control pressurized water system as claimed in claim 1, wherein: the first type of downcomer well is a medium-depth tube well with the well depth of 23-30 m.
6. A seal-and-fall combined control pressurized water system as claimed in claim 1, wherein: the second type of downcomer well is an ultra-deep tube well with the well depth of 35-45 m.
7. A seal-and-fall combined control pressurized water system as claimed in claim 1, wherein: and the first type of downcomer well and the second type of downcomer well are both provided with submersible pumps, and the submersible pumps are positioned in the filter pipes and used for pumping pressure-bearing water in the foundation pit.
8. A seal-drop combined confined water system as claimed in claim 7 whereinIn the following steps: the pump capacity of the submersible pump is 60-80 m3/h。
9. A seal-and-fall combined control pressurized water system as claimed in claim 1, wherein: the pit-in-pit comprises a main building, a water collecting well and an elevator shaft.
10. A seal-and-fall combined control pressurized water system as claimed in claim 7, wherein: a water meter and a water stop valve are also arranged above the first type of downcomer well and the second type of downcomer well, the water meter is used for monitoring the amount of confined water discharged from the control confined water system, and the water stop valve is used for preventing high-pressure water from reversely flowing back into the submersible pump to damage the submersible pump; the water meter and the water stop valve are connected with the submersible pump through a water pipe.
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| CN202021539813.5U CN213448534U (en) | 2020-07-29 | 2020-07-29 | Sealing and lowering combined pressure-bearing water control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837207A (en) * | 2022-05-13 | 2022-08-02 | 北京城建集团有限责任公司 | Foundation pit dewatering structure and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837207A (en) * | 2022-05-13 | 2022-08-02 | 北京城建集团有限责任公司 | Foundation pit dewatering structure and method |
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